Photos: Explosion at Williams Olefins

File photo provided -- Workers run from a massive fireball after an explosion in the  Williams Olefins plant on June 13, 2013, that killed two and injured more than 100 workers and contractors. Probes of the explosion remain underway.
File photo provided -- Workers run from a massive fireball after an explosion in the Williams Olefins plant on June 13, 2013, that killed two and injured more than 100 workers and contractors. Probes of the explosion remain underway.

An explosion killed one man and injured at least 77 people Thursday at the Williams Olefins plant near Geismar.